Reduce Pholio brokenness for non-image files
Summary:
Ref T5359. When users upload non-image file types (PDFs, text files, whatever), Pholio currently chokes in a few places. Make most of these behaviors more reasonable:
- Provide thumbs in the required sizes.
- Predict the thumb size of these files correctly.
- Disable inline comments.
- Make "View Fullsize" and "Download" into buttons. These mostly-work. Download should probaly really download, but CSRF on forms is a bit of a pain right now.
Test Plan: See screenshots.
Reviewers: chad
Reviewed By: chad
Subscribers: epriestley
Maniphest Tasks: T5359
Differential Revision: https://secure.phabricator.com/D9548
